import router from './router'
import store from './store'
import {Message} from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import {getToken, removeToken} from '@/libs/auth' // get token from cookie
import getPageTitle from '@/libs/get-page-title'
import Layout from '@/layout'
import ParentView from '@/views/parent-view'

const _import = require('./router/_import_' + process.env.NODE_ENV) // 获取组件的方法

NProgress.configure({showSpinner: false}) // NProgress Configuration

const whiteList = ['/login', '/auth-redirect', '/404', '/401'] // no redirect whitelist

router.beforeEach(async (to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({path: '/'})
      NProgress.done()
    } else {
      // determine whether the user has obtained his permission roles through getInfo
      const hasRoles = store.getters.roles && store.getters.roles.length > 0
      if (hasRoles) {
        next()
      } else {
        try {
          // get user info
          // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
          const userInfo = await store.dispatch('user/getInfo')
          await store.dispatch('permission/loadMenu')
          let roles = userInfo.resources;
          if (!roles || roles.length === 0) {
            removeToken()
            next('/401')
          } else {
            console.log(111)
            // 过滤路由
            const accessRoutes = filterAsyncRouter(store.getters.sidebarRouters);
            // 添加动态路由
            router.addRoutes(accessRoutes)
            // 保存路由
            store.commit('permission/SET_ROUTES', accessRoutes)

            // hack method to ensure that addRoutes is complete
            // set the replace: true, so the navigation will not leave a history record
            next({...to, replace: true})
          }
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})


// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (route.component) {
      if (route.component === 'Layout') {
        route.component = Layout
      } else if (route.component === 'ParentView') {
        route.component = ParentView
      } else {
        route.component = _import(route.component) // 导入组件
      }
    }
    if (route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children)
    }
    return true
  })
  return accessedRouters
}
